Q.
Select the correct statement:
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a
Cathode rays are electromagnetic waves, but anode rays are not.
b
Electromagnetic waves need a material medium for their propagation.
c
Electromagnetic waves may have different frequencies.
d
Electromagnetic waves consist of some material particles travelling with the speed of light.
answer is C.
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Detailed Solution
Electromagnetic waves may have different frequencies but travel with same speed = velocity of light.
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